NAME¶
gpiv_vorstra - Calculates the differential quantities vorticity, shear strain
and normal strain from PIV data.
SYNOPSIS¶
gpiv_vorstra [
-d N] [
-h |
--help] [
-n |
-o |
-s] [
--no_g ] [
-p |
--print] [
-g |
--g] [
-v |
--version] [
filename] <
stdin >
stdout
DESCRIPTION¶
gpiv_vorstra calculates the differential quantities like vorticity, shear
strain and normal strain from PIV data. You can choose from several
differential schemes: central differentiation, least squares, Richardson
extrapolation and circulation method. Circulation method only allows one to
calculate vorticity, but no strain. The output can be generated as ASCII data
containing four columns or as GNUPlot Data format that allows one to
view/print the data as contour plots.
The configuration parameters (containing the
POST key) may be overruled
by the command line options, as explained below.
Options¶
- -d N
- Differential type to be used: central difference (
N=0), least squares ( N=1), Richardson interpolation (
N=2), circulation method ( N=3)
- -h | --help
- On-line help
- -n
- Calculate normal strain of the PIV data. As an alternative
the program may be called by its nickname gpiv_nstrain. In
combination with filename the output will be written to
filename .nstr.
- -o
- Calculate vorticity of the PIV data. As an alternative the
program may be called by its nickname gpiv_vorty. In combination
with filename the output will be written to
filename.vor.
- -p | --print
- Print parameters, command line options and eventually used
input and output filenames to stdout. The output is identic of
filename .par, in case filename is used.
- -s
- Calculate shear strain of the PIV data. As an alternative
the program may be called by its nickname sstrain. In combination
with filename the output will be written to
filename.sstr.
- -g
- Show contour plot of the output with gnuplot.
- --no_g
- Suppresses to show contour plot of the output with gnuplot.
- -v | --version
- Print version information on standard output, then exit
successfully.
- filename
- Input PIV data file. Overrides stdin and stdout. The output
will be written to filename.vor with -o,
filename .nstr with -n or filename.sstr
with -s. Parameters are stored in filename.par and
may be used for future use by including them in ./gpivrc.
SEE ALSO¶
gpivtools
AUTHOR¶
Gerber Van der Graaf
